$ git clone -n https://src.fedoraproject.org/rpms/root-tail.git /var/lib/mock/f40-build-796415-140692/root/chroot_tmpdir/scmroot/root-tail
Cloning into '/var/lib/mock/f40-build-796415-140692/root/chroot_tmpdir/scmroot/root-tail'...
$ git fetch origin bf89f4c25ba02c0306a97d7ebd2f652dcf1b6429:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/root-tail
 * [new ref]         bf89f4c25ba02c0306a97d7ebd2f652dcf1b6429 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf89f4c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild